docs: def _checkIfCode(self, inCodeBlockObj):
          """Checks whether or not a given line appears to be Python code."""
          while True:
              line, lines, lineNum = (yield)
              testLineNum = 1
              currentLineNum = 0
              testLine = line.strip()
              lineOfCode = None
              while lineOfCode is None:
                  match = AstWalker.__errorLineRE.match(testLine)
                  if not testLine or testLine == '...' or match:
                      # These are ambiguous.
                      line, lines, lineNum = (yield)
                      testLine = line.strip()
                      #testLineNum = 1
                  elif testLine.startswith('>>>'):
                      # This is definitely code.
                      lineOfCode = True
                  else:
                      try:
                          compLine = compile_command(testLine)
                          if compLine and lines[currentLineNum].strip().startswith('#'):
                              lineOfCode = True
                          else:
                              line, lines, lineNum = (yield)
                              line = line.strip()
                              if line.startswith('>>>'):
                                  # Definitely code, don't compile further.
                                  lineOfCode = True
                              else:
                                  testLine += linesep + line
                                  testLine = testLine.strip()
                                  testLineNum += 1
                      except (SyntaxError, RuntimeError):
                          # This is definitely not code.
                          lineOfCode = False
                      except Exception:
                          # Other errors are ambiguous.
                          line, lines, lineNum = (yield)
                          testLine = line.strip()
                          #testLineNum = 1
                  currentLineNum = lineNum - testLineNum
              if not inCodeBlockObj[0] and lineOfCode:
                  inCodeBlockObj[0] = True
                  lines[currentLineNum] = '{0}{1}# @code{1}'.format(
                      lines[currentLineNum],
                      linesep
                  )
              elif inCodeBlockObj[0] and lineOfCode is False:
                  # None is ambiguous, so strict checking
                  # against False is necessary.
                  inCodeBlockObj[0] = False
                  lines[currentLineNum] = '{0}{1}# @endcode{1}'.format(
                      lines[currentLineNum],
                      linesep
                  )